last I checked Easter was about "some Thursday, nearly two thousand years ago, where one man got nailed to something made off wood for saying how great it would be to be nice to people for a change" to quote Douglas adams

Lepus is latin for Hare, and that one comes from Eostre, the Anglo-Saxon goddess of spring, whose festival was held at the vernal equinox. The hare was a symbol of fertility. One fable has Eostre creating the bunny (actually a hare) from a bird as a treat for her children. The bunny was unhappy that it was no longer a bird so Eostre allowed it to lay eggs once a year.

and the Eggs isnt unike for the Easter bunny/hare, you also have stories and fokelore about Leprechaun Eggs

so as I sayed, it depends on how you look at it.
the lepus event should start around Saint Patrick's Day and end when the christian easter ends.